Hi, I have a simple "matrix" (nested list) defined as such:
M = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] I'm trying to come up with a different way of getting its, well, "reverse antidiagonal", since the actual antidiagonal of M goes from M[0, N] to M[N, 0] according to http://planetmath.org/encyclopedia/AntiDiagonalMatrix.html: j = 0 for i in range(len(M)-1, -1, -1): print M[i][j] j += 1 This works fine, but I was looking for a different solution, just for kicks, and came across something interesting. I can do: >>> i, j = range(len(M)), range(len(M)-1, -1, -1) >>> i [0, 1, 2] >>> j [2, 1, 0] Theoretically, I could then just iterate over range(len(M)) and grab M[i[N]j[N]], but that's not legal. What would be the right way of doing this? Thanks in advance, Carlos _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
